Wouldn't this be applied against the base weapon speed? All the IAS bonuses should be cumulative, resulting in your final attack speed. So try adding all the IAS bonuses together (including that on your weapons), and then apply that against the base weapon attack speed. That should provide your final attack speed.
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FrankJul 9 '12 at 14:38

Doing it this way returns wrong result, normal DPS 37015.57, with Enchantress in game: 37940.96, when I apply the 3% to the weapons AS I get: 38126.03
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JohnJul 9 '12 at 14:47

Oh, are you looking at how IAS increases DPS, not trying to calculate your final attack speed?
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FrankJul 9 '12 at 14:48

I am asking how do i apply the enchantress buff (or how does the game calculate it) to my current dps formula, ive tried 8 different connotations with no luck.
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JohnJul 9 '12 at 14:51

You're going to want to look here and here. This question is probably a duplicate of the second.
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FrankJul 9 '12 at 15:02

1 Answer
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Firstly Blizzard have screwed up, adding 3% to your AS is in fact to add 0.03 as a direct figure to your (Weapons AS * Weapon IAS) value, this returns me a figure that is now only .1 of a decimal out of the in game figure which is unfortunately acceptable.

Hrm. The Enchantress's IAS bonus is added after calculating weapon speed? That doesn't seem right. I'll do some testing when I get home to corroborate.
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FrankJul 9 '12 at 15:28

I did not think so either however setting it this way returns my attack speed to within 0.01 decimal point.
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JohnJul 9 '12 at 16:08

This is most likely wrong. While it might be roughly accurate in your case, it cannot be the general formula. If the formula was like that, it would not be a percentage. The skill would say "adds 0.03 attacks per second". You should reveal the actual values you used in the computation, because this seems highly unlikely.
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AlderathJul 9 '12 at 22:47

@Alderath Just because it says it adds 3% does not mean it actually does. I think John is correct. I am having the same issue. If you add .03 cumulatively, a weapon with 1.4 attacks per second should come out to 1.44 (1.4 * 1.03), but the in-game screen says 1.43.
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egervariAug 25 '12 at 0:22